Rotary pump



April 2, 1940- J. L. BILDERBECK 2,195,834

. ROTARY PUMP Filed Oct. 21, 1957 s Sheets-Sheet 1 April 2, 1940. J. L. BILDERBECK ROTARY PUMP s Sheets-Sheet :2

Filed 001;. 21, 1937 z/ama WWW ' J. L. BILDERBECK ROTARY PUMP Filed Oct. 21, 1937 April 2, 1940.

3 Sheets-Sheet 3 Patented Apr. 2, 1940 UNITED STATES PATENT OFFICE noun PUMP James Lorin Bilderbeck, Newben'y, Fla. Application October 21, 1937, Serial No. 170,266]

Claims.

l5 Another object of the invention is to provide a novel form of construction in which the parts of the mechanism may be readily adjusted in position to provide for wear and to minimize the friction developed during operation.

20 Another object of the invention is to provide a form of pump having greater capacity than pumps of equal size in which all the vane members are completely enclosed in the stator housing and move at right angles with the rotor shaft.

25 Another object of the invention is to provide a novel method of construction and assembly of the piston and parts thereof by which a more accurate fit and adjustment of parts may be obtained than was heretofore possible with prior 30 methods. I

' Another object of the invention is to provide a novel form of pump having a form of vane assembly of novel construction which in itself is provided with a large pumping chamber which may 5 be used to pump oil for lubricating and cooling while the larger outer pump serves to pumpair' or other fluid, or vice versa.

With these and'other objects in view, the invention comprises the various features herein- 40 after more fully described and defined in the claims.

The various features of the invention are illustrated in the accompanying drawings, in which: Fig. 1 is a plan view of the preferred form of 5 the invention; I

Fig. 2 is an end view of the pump shown in Fig. 1 with the front cover plate removed;

- Fig. 3 is a plan view of the vane element and rotor member which are shown carried by the 50 rear cover plate;

Fig. 4 is a sectional view in elevation taken on the section line 4-4 of Fig. 1;

Fig. 5 is a view in elevation, partly in section taken substantially on the section line 5-5 of 5 Fig. 2;

Fig. 6 is a sideview, partly in section, showing the end cover plate together with the guide sleeve on which the vane member rides and by which it is maintained in contact with the interior surface of the stator casing; 5

Fig. 6A is an end view of one of the hub portions 69;

Fig. -7 is a view in elevation, partly in section, of a portion of the rotor element together with the shaft on which it is mounted. 10

Referring more in detail to the drawings, the numeral 2 designates the stator housing or outer casing of the pump mounted on the usual standardor base 3.

In the form of rotary pump illustrated in Figs. 1-7 inclusive,,the invention is shown as applied to a preferred form of rotary pump in which the rotor 4 is mounted eccentrically with respect to the axis 3 of the inner cylindrical surface 6 of the casing and concentrically with respect to the go rotor shaft 8.

The rotor member 4 comprises an outer member I0 having an outer cylindrical surface 12, the axis of which lies substantially at the center or axis of the shaft 8, and an inner cylindrical surface I4 of smaller diameter so as to .provide the desired thickness of metal, the axis of the inner cylindrical surface being located, with reference to Fig. 2, above 'the axis of shaft 8, or substantially at the uppermost element of the cylindrical surface of the shaft 8, for example. By means of. this construction an interior opening I6 is provided within which the main operating parts of the vane element l8of the rotor member are mounted.

In order to provide a delicately adjusted working surface for the vane element iii of the rotor member, I preferably form a main vane member 20 having side portions I9 and 2| which straddle the shaft member 8, the side portions having parallel side surfacm 22 and 24 respectively which engage and slide on the corresponding parellel fiat surfaces 23 and 25 of the cylindrical segments 26 and 28 which are held in place within.the member ID by means of set screws 30 and 32, or other equivalent means.

Seated on the main vane member 20 is a curved saddle member 34 having a central threaded portion 36 for screw 44 and curved end portions 38 and 40, each of which has a curvature correo Themember, 34 is preferably held in place on the main vane member 20 by means of upper curved members 42 and 43, which are in turn held in place on the member 34 by means of set screws 46-and 48 (Fig. 5) which pass downwardly through elongated openings 50 and 52 in the member 34 and engage the main vane member 20, serving to hold the parts in proper position relative to the interior surface 6.

In order to maintain the ends 38 and of the saddle member 34 in contact with the cylindrical surface 6, a ring bearing member 6|], mounted on the shaft or tube member 6| (Fig. 6) is provided, the vane part 34 being forced outwardly by means of a set screw 44 which engages a stop member (Fig. 4) which rides on the outer surface of the tube 60. The screw 44 passing through slot 53 in vane member 20 serves, furthermore, to make adjustments for wear on the outer surfaces or ends 38 and 40 on the inner cylindrical surface 6, and also to compensate for wear between the stop member 45 and the outer surface of the bearing 60.

It will be apparent that shims may be employed between the surfaces of the members 34 and 20 and between members 34 and 42 to obtain the desired spacing by which the end portions 38 and 40 will engage the interior surface 6 with the desired pressure or spacing.

The outer section of the rotor or member ID is preferably rigidly connected to a member 54 (Fig. 7), through which the shaft 8 extends, the said member 54 being connected to the shaft by means of a set screw 55, for example, and to the outer member [0, by means of set screws 58, or the like.

The bearing member on which the movable -vane member l8 rides abuts the member 54 (see comprising larger or outer portions 63 and 65' which are preferably bolted to the stator wall of the casing and smaller or inner hub portions. 63 which house the ends of the rotor shaft in bores 13. The smaller portions are preferably bolted to the larger portions through holes 1| and 12, which are slightly elongated laterally. This construction allows the rotor to be adjusted to some extent with reference to the inner cylindrical wall of the stator, thus permitting the eccentricity of the rotor to be varied without moving the bearing member 60 on the plate 63 since plate 63 is arranged to support tube 6|. Thus the opening 14 through the bearing 60 and tube 6| is larger than the rotor shaft 8 in order to permit movement therein.

It willbe apparent that as the rotor member 4 is revolved, the vane member l8 rides ineifect on the cylindrical surface of the concentric tube member 60 which is eccentric with respect to the in Fig. 4 after which it is gradually retracted to the position shown in Fig. 4.

During the rotation of the vane member I. in a clockwise direction, the end portion 40 of the saddle member 34 forces the liquid ahead of it out through the exit pipe 62.

As the end portion 38 passes the opening to the intake pipe 64, a suction is created by the increasing space between the upper mid-point or point of tangency of the outer surface |2 of the rotor element with the inner cylindrical surface 6 and the end 38 of the vane member, whereby the space is gradually filled up to the point that the end 38 of the saddle portion 34 reaches the port leading to the delivery or exhaust pipe 62, whereupon further movement of the vane member forces the fluid or liquid out through the exit pipe 62.

Rotation of the rotor member 4 is produced by rotation of the shaft member 8, which is suitably attached or connected to the rotor member as shown in Fig. 7, the vane member being thereby forced to rotate with the shaft.

The skirt portions 2|, IQ of the vane member ll preferably extend downwardly so as to be below the centerof rotation in the upper position of the vane member as shown in Fig. 2 of the drawings.

In the manufacture of the rotor member 4, the parts which are to cooperate by sliding on each other are preferably first formed and assembled by milling or otherwise forming the parallel plane surfaces-22 and 24 on the main vane member 20 and then clamping or suitably attaching the side members 26 and 28 to the vane member, the side members having surfaces corresponding to the surfaces 22 and 24 so as to permit smooth sliding action during operation of the rotor. While the side members 26 and 23 are held in contact with the skirt portions 2| and IQ of the member 20, the outer cylindrical surfaces 29 and 3| are machined to a diameter so as to just fit the internal diameter of the inner cylindrical surface l4.

After the parts 26 and 23 have been attached to the outer rotor member ID by means of the set screws 3|! and 32, a substantially perfect slidin fit will be obtained, between the surfaces 22 and 24 of the vane member l8 and the surfaces 23 and 25 in the outer portion of the rotor member.

The mode of operation of this form of the invention will be obvious from the above description.

It will be understood that various changes or modifications may be made in the forms ofthe device as described and illustrated without departing from the spirit or scope of the invention as defined in the claims.

Having thus described the invention, what is claimed as new is:

1. In adevice of the kind described, the combination comprising a stator casing having a cylindrical inner surface providing an inner chamber; an inlet to and an outlet from said chamber, a hollow piston eccentrically mounted in said chamber, a drive shaft extending through the central axis of said piston and suitably held to said piston, an opening through the periphery of said piston and extending radially inward, said opening having opposite parallel sides, a vane member having parallel sides and a slot therethrough reciprocably mounted in said opening, the parallel sides of the former fitting respectively the parallel sides of the latter; a saddle member having slots therethrough riding on said inner cylindrical surface, said saddle member having concentric concave and convex surfaces engaging said vane member, a screw threaded through the central portion of said saddle member and extending radially inward with reference to said inner cylindrical surface through the 'slot in said vane member, said vane slot being elongated so as to permit oscillation of said vane member with reference to said screw; means by 'which said screw adjustably holds said saddle member in contact with said inner cylindrical surface; and means by which said vane member is adjust-ably held to said saddle member in a sealed hinged joint.

' 2. In a rotary pump comprising a casing having cal surfaces with slots therethrough and a vane.

member having 'a concave surface adapted, to engage the convex cylindrical surface of said saddle member so as-to permit oscillation thereat,

said saddle member slidably engaging said cyllndrical inner surface; a couple of smaller saddles having each a'convex surface matching and COD? tacting the concave cylindrical surface of said saddle member so as to cover said slots, said smaller saddlesholding the heads of screws, said screws, extending through said slots and engagin threads in said vane member, so as to hold said vane member in adjustable contact with said saddle member, said slots being elongated in. the

direction of oscillation of said vane member.

3. In a rotary pump comprising a casing having a cylindrical inner surface with inlet and outlet openings leading therefrom, a cylindrical piston mounted in said casing tangent to said cylindrical inner surface, a drive shaft operatively connected to said piston and a vane assembly comprising a saddle member slidably engaging said cylindrical inner surface and a vane member having parallel sides; a cylindrical opening in the pe-' riphery of said piston and a couple of packing pieces having supporting set screws, said-packing pieces having each a curved portion and a plane face opposite said curved portion, said packing pieces being initially arranged'in said openin on either side of said vane member with said plane faces automatically engaging the'parallel sides of said vane member respectively when thus assembled; said set screws having threads engaging said piston, said packing pieces being furthermore adapted to hold shims when needed to compensate for excessive wear of said plane surfaces, said vane member reciprocating between said packing pieces during the rotation of said piston so that the spaces thus formed between said'piston, said casing and said vane member are alternately increased and diminished.

4. In a rotary pump comprising a casing having inlet and outlet openings leading from a cylindrical inner surface of said casing, a tube member mounted concentrically with reference to said cylindrical inner surface, a cylindrical piston mounted in said casing tangent to said cylindrical inner surface, a drive shaft operatively mounted through the axis of said piston and a vane assembly comprising a curved saddle member and a vane member; said saddle member supporting a screw extending radially therethrough and engaging threads therein,'said piston having a longitudinal opening in the periphery thereof extending radially inward, said vane member being reciprocably mounted in said opening and slidably -attached to said saddle member so as to divide the space between said piston and said casing; a ring bearing concentrically mounted on said tube member and a stop member having a broad concave surface engaging said ring bearing and having a recess opposite said concave surface, said screw rotatably fitting in said recess, said saddle member being thus adapted to recede or advance on the threads of said screw, the means serving to hold said saddle member in adjustable contact with said cylindrical inner surface.

5. In a rotary pump comprising a casing having a cylindrical inner surface with inlet and outlet openings leading therefrom, cover plates secured to said casing, a cylindrical piston mounted eccentrically in said casing, a drive shaft axially connected to said piston, and a vane assembly having a saddle member slidably engaging said cylindrical inner surface, said piston having a peripheral opening, said vane assembly reciprocating within said opening during the rotation of said piston so as to divide the space between said piston and said casing into pulsating compartments; a tube member mounted concentrically in said casing on one of said cover plates, said tube member having a hole slightly larger than the diameter of said drive shaft, said hole being located off-center through said tube member,-said vane assembly having means rotatably supported by said tube member, a hub having bolts loosely fitted therethrough, said bolts being screwed to one of said cover plates, said drive shaft extending through the hole in said tube member, an end of said'shaft rotatably fitting in said hub so as to be therewith adjustable with reference to said tube member in varying the eccentricity of said piston.

JAMES LORIN'BILDERBECK. 

